Watch a live ceremony at Twickenham Stadium today (June 10) with Prince Harry and 2003 World Cup winners Jonny Wilkinson and Will Greenwood to mark the official countdown to the 2015 Rugby World Cup.
The event, at 11.30am, will be shown using a live Periscope stream that can be followed on Twitter (follow @rugbyworldcup) and will be shown on the big screens in Piccadilly Circus.
The tournament starts September 18 with England kicking off against Fiji.
There will also be games shown at the Queen Elizabeth Olympic Park - the first one will be New Zealand vs Africa 1 on September 24.
The Gun on Coldharbour will be hosting packages for the matches.